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From eb2c6897f36d560f84ed5124b246f2759c470f11 Mon Sep 17 00:00:00 2001
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From: "Darrick J. Wong" <darrick.wong@oracle.com>
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Date: Tue, 10 Nov 2020 15:11:09 -0500
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Subject: [PATCH] xfs: use the finobt block counts to speed up mount times
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Source kernel commit: 1ac35f061af011442eeb731632f6daae991ecf7c
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Now that we have reliable finobt block counts, use them to speed up the
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per-AG block reservation calculations at mount time.
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Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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Reviewed-by: Brian Foster <bfoster@redhat.com>
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Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
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---
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diff --git a/libxfs/xfs_ialloc_btree.c b/libxfs/xfs_ialloc_btree.c
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index 9db87e9..b1adc80 100644
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--- a/libxfs/xfs_ialloc_btree.c
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+++ b/libxfs/xfs_ialloc_btree.c
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@@ -593,6 +593,28 @@ xfs_inobt_count_blocks(
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return error;
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}
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+/* Read finobt block count from AGI header. */
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+static int
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+xfs_finobt_read_blocks(
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+ struct xfs_mount *mp,
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+ struct xfs_trans *tp,
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+ xfs_agnumber_t agno,
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+ xfs_extlen_t *tree_blocks)
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+{
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+ struct xfs_buf *agbp;
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+ struct xfs_agi *agi;
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+ int error;
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+
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+ error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
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+ if (error)
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+ return error;
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+
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+ agi = agbp->b_addr;
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+ *tree_blocks = be32_to_cpu(agi->agi_fblocks);
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+ xfs_trans_brelse(tp, agbp);
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+ return 0;
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+}
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+
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/*
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* Figure out how many blocks to reserve and how many are used by this btree.
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*/
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@@ -610,7 +632,11 @@ xfs_finobt_calc_reserves(
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if (!xfs_sb_version_hasfinobt(&mp->m_sb))
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return 0;
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- error = xfs_inobt_count_blocks(mp, tp, agno, XFS_BTNUM_FINO, &tree_len);
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+ if (xfs_sb_version_hasinobtcounts(&mp->m_sb))
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+ error = xfs_finobt_read_blocks(mp, tp, agno, &tree_len);
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+ else
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+ error = xfs_inobt_count_blocks(mp, tp, agno, XFS_BTNUM_FINO,
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+ &tree_len);
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if (error)
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return error;
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